3 apples Granulated sugar1/4 teaspoon cinnamonPreheat oven to 225°F.Using a mandolin, slice apples very thinly after washing.Line 1-2 baking sheets with parchment paper and spread out the apple slices in a single layer. Sprinkle lightly with cinnamon and sugar.Bake for one hour, flip apple slices over, and continue to bake for another hour to an hour and a half.Turn off oven and let slices cool in the oven for about an hour before removing from the oven. Store apple chips at room temperature in an airtight container for up to 1 week.